Rand fucked-up by coming out against the loudmouthed disrupter as hard as he did.
Jealousy of Trump's success with the electorate was probably a big part of the motivation for why he did that.
Even if Rand only came out in support of Trump's ability to root the neocons out of the GOP, many people in this movement would cry and gnash their teeth until the cows came home.
I think that he would be a lot better off preserving whatever "pure libertarian" credentials he has left.
The best thing for Rand to do is wait until the general to endorse, and then simply adapt to/take advantage of the "reformutation" of the GOP that is going to occur if/when Mr. Wrecking-Ball gets elected President.